#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main()
{
    int a, b, c;
    while (scanf("%d %d %d", &a, &b, &c) != EOF)
    {
        if ((a + b > c) && (a + c > b) && (b + c > a))
        {

            if (a == b && a == c & b == c)
                printf("Equilateral triangle!\n");
            else if ((a == b && a != c && b != c) || (c == b && c != a && b != a) || (a == c && a != b && c != b))
                printf("Isosceles triangle!\n");
            else
                printf("Ordinary triangle!\n");
        }
        else
            printf("Not a triangle!\n");
    }
    return 0;
}